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Contrast Analysis on Echo Characteristics of Summer Seeded Cumulus Clouds

Yuan Ye Feng Jingyi Jiang Nianchong Wu Wangyi(Anhui Weather Modification Office,Hefei 230061)  
Based upon 3 pairs of cumulus in the Jiang-huai area cumulus cloud-seeding experiment,a contrast analysis of echo characteristics of CINRAD between the target cloud and the reference cloud was performed.It was found that the average lasted time of the target cloud was 51.2% longer than that of the reference cloud and the average echo area of the target cloud was 17% larger than that of the reference.And the average water content of per volumn scanning of the target cloud was larger than that of the reference,with a difference of 46% between the target cloud and the reference in the whole life time of clouds.It concluded that the seeded could increase the area of echo,prolong the lasting time of the echo,and increase the water content of clouds in its whole life.Besides,from one pair of cumulus,it was found that the time of seeding was rather important for convective cloud.If the convective cloud is situated in its weakening phase,seeding could not increase the water content and couldn't prolong its life as well.
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